Affiliation:
1. Delft University of Technology
2. University of York
3. Cornell University
4. City University of New York
Abstract
Near-field scanning optical microscopy is a powerful technique for
imaging below the diffraction limit, which has been extensively used
in biomedical imaging and nanophotonics. However, when the
electromagnetic fields under measurement are strongly confined, they
can be heavily perturbed by the presence of the near-field probe
itself. Here, taking inspiration from scattering-cancellation
invisibility cloaks, Huygens–Kerker scatterers, and cloaked sensors,
we design and fabricate a cloaked near-field probe. We show that, by
suitably nanostructuring the probe, its electric and magnetic
polarizabilities can be controlled and balanced. As a result,
probe-induced perturbations can be largely suppressed, effectively
cloaking the near-field probe without preventing its ability to
measure. We experimentally demonstrate the cloaking effect by
comparing the interaction of conventional and nanostructured probes
with a representative nanophotonic structure, namely, a 1D
photonic-crystal cavity. Our results show that, by engineering the
structure of the probe, one can systematically control its back action
on the resonant fields of the sample and decrease the perturbation by
>
70
%
with most of our modified probes, and
by up to 1 order of magnitude for the best probe, at probe-sample
distances of 100 nm. Our work paves the way for non-invasive
near-field optical microscopy of classical and quantum
nanosystems.
Funder
European Research Council
Air Force Office of Scientific
Research
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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